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NEW QUESTION # 47
The figure shows the simplified topology of an enterprise campus network. On this network, the aging time of dynamic MAC address entries on switches is 300 seconds. Employee A uses PC1 to connect to the GE1/0/1 port of the switch and continuously communicates with PC3 for 10 minutes. After that, the employee disconnects the network cable and leaves the workstation. Subsequently, PC4 continues to communicate with PC3. After 30 minutes, employee B connects PC2 to GE1/0/1 of SW1, and PC2 ' s ARP cache table is empty.
At this point, when SW1 receives an ARP request from PC2, it will search the MAC address table and forward the request packet only through GE1/0/3.
Answer: B
Explanation:
An ARP Request is carried in an Ethernet broadcast frame whose destination MAC address is FF-FF-FF-FF- FF-FF. When SW1 receives the ARP Request from PC2, it does not look up a single destination MAC entry and send the frame only toward PC3. Instead, the switch floods the broadcast frame through all other eligible ports in the same VLAN, excluding the ingress port. The 300-second MAC aging time reinforces why the earlier PC1 entry is not relevant after 30 minutes: a dynamic entry that is not refreshed will age out long before PC2 is connected. PC4 ' s continued communication with PC3 may refresh MAC entries associated with that traffic, but it does not transform PC2 ' s ARP Request into a known unicast frame. ARP relies on broadcast precisely because the sender does not yet know the target ' s Layer 2 address. Therefore, the claim that SW1 forwards the request only through GE1/0/3 is incorrect. The verified answer is FALSE, option B.
NEW QUESTION # 48
The essence of communication is the transmission and exchange of information between two or more points. The three elements of communication are the sender, content, and transmission channel of the information. The receiver of the information is not included among these elements.
Answer: B
Explanation:
This statement is false because the receiver is one of the fundamental elements of communication. In basic communication theory, a complete communication process requires at least four essential elements: the sender, the information or message content, the transmission medium or channel, and the receiver. If the receiver is missing, communication cannot be completed because there is no endpoint to accept, interpret, or respond to the transmitted information.
In datacom networks, this concept maps directly to real networking scenarios. A source host generates data, the data is carried over some medium such as copper, fiber, or wireless, and a destination host receives the data. Network devices such as switches and routers assist the forwarding process, but the fundamental communication model still includes both communicating endpoints. HCIA-Datacom emphasizes the complete sender-to-receiver process when introducing network communication basics, protocol encapsulation, and forwarding. Therefore, excluding the receiver from the communication elements is conceptually incorrect. The correct understanding is that sender, receiver, information content, and channel together form the essential basis of communication.
NEW QUESTION # 49
Which of the following variables defined in Python code is invalid?
Answer: C
Explanation:
In Python, variable names must follow identifier rules: they cannot start with a digit. The variable
2_r1 is invalid because it begins with the number 2, which violates Python naming conventions.
The other variables are valid because they either start with letters or underscores and follow proper identifier rules.
NEW QUESTION # 50
The administrator runs the interface Eth-Trunk 1 command to create Eth-Trunk 1 on SW1 and SW2. After the network is stable, the administrator runs the display interface brief command on SW1, and finds that Eth-Trunk 1 is Down, the states of its member interfaces are normal, and the configuration on SW1 is correct. The possible cause is that the member interfaces on SW2 are not added to Eth-Trunk 1.
Answer: B
Explanation:
An Eth-Trunk will remain down if there is a configuration inconsistency between the two ends, but it is not specifically caused by missing member interfaces on the remote device alone. Even if SW2 has not added member interfaces, the local configuration and negotiation state (such as LACP or static Eth-Trunk consistency checks) would still determine the status, and other mismatch conditions could also lead to the same symptom. Therefore, the stated cause is not the only or guaranteed reason for the Eth-Trunk being down, making the statement incorrect.
NEW QUESTION # 51
A router ID uniquely identifies a device in an AS, and must be present before the device can run OSPF. For a device running OSPFv2, if no router ID is manually configured, the system automatically selects one.
Answer: B
Explanation:
In OSPFv2, a router ID is required for OSPF to operate and uniquely identifies each router within an AS. If no manual router ID is configured, the system automatically selects the highest IP address of a loopback interface; if no loopback exists, it selects the highest IP address of a physical interface. Therefore, the statement is correct.
NEW QUESTION # 52
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